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c#用反射原理递归遍历复杂实体对象
之前在网上看到的都是遍历那种比较简单的实体对象,但是如果有实体嵌套,甚至是包含有List<XXInfo>这种属性的时候就没有办法处理了。通过递归遍历的方式可以完成对复杂实体对象的所有属性的遍历,可以取值和赋值。
下面是关键部分的代码,有什么不对的地方路过的大大一定要指点哈。
using System.Reflection;
public System.Text.StringBuilder strB = new System.Text.StringBuilder(); public void GetInfoPropertys(object objInfo) { if (objInfo == null) return; Type tInfo = objInfo.GetType(); PropertyInfo[] pInfos = tInfo.GetProperties(); if (tInfo.IsGenericType) { System.Collections.ICollection Ilist = objInfo as System.Collections.ICollection; if (Ilist != null) { strB.AppendFormat("集合子属性{0}<br/>", Ilist.Count); foreach (object obj in Ilist) { GetInfoPropertys(obj); } } else { strB.Append("泛型集合为空<br/>"); } return; } foreach (PropertyInfo pTemp in pInfos) { string Pname = pTemp.Name; string pTypeName = pTemp.PropertyType.Name; object Pvalue = http://www.mamicode.com/pTemp.GetValue(objInfo, null); "String")) { string value = http://www.mamicode.com/(Pvalue == null ?"为空" : Pvalue.ToString()); strB.AppendFormat("属性名:{0},属性类型:{1},属性值:{2}<br/>", Pname, pTypeName, value); } else { string value = http://www.mamicode.com/Pvalue == null ?"为空" : Pvalue.ToString(); strB.AppendFormat("<br/><b>子类</b>,属性名:{0},属性类型:{1},属性值:{2}<br/>", Pname, pTypeName, value); strB.Append("----------------------------------------------<br/>"); GetInfoPropertys(Pvalue);
}
} }
利用反射实现表格式Excel文档的导出:
上次客户提出了要将数据导出到类似上图的固定格式的Excel文档中,当然真实的表格不是上面那样的,而且表格的格式有十多种,最后采用的解决办法就是利用C#的反射。大概的思路是这样的,为每种导出的表格样式都做一个xml的配置文件,然后记录每个需要复制的文本框的坐标,以及这个值在实体类中的名称,针对上面的那种表格格式,xml配置文件是这样的:
<?xml version="1.0" encoding="utf-8"?> <XML TableName="table1.xml" OtherInfo="">
<Field Fname="NAME" PropertyName="NAME" Desc="姓名"> <x>4</x> <y>3</y> </Field> <Field Fname="SEX" PropertyName="SEX" Desc="性别"> <x>10</x> <y>3</y> </Field> <Field Fname="BIRTHDAY" PropertyName="BIRTHDAY" Desc="出生年月"> <x>4</x> <y>4</y> </Field> <Field Fname="Zz" PropertyName="Zz" Desc="政治面貌"> <x>10</x> <y>4</y> </Field> <Field Fname="HunYin" PropertyName="HunYin" Desc="婚姻状况"> <x>4</x> <y>5</y> </Field> <Field Fname="Tel" PropertyName="Tel" Desc="联系电话"> <x>10</x> <y>5</y> </Field> <Field Fname="WorkHistory" PropertyName="WorkHistory" Desc="工作经历"> <x>13</x> <y>1</y> </Field>
<!--Field Fname="SaleGuid" PropertyName="SaleList.SaleGuid" Desc="销售记录编号"> <x></x> <y></y> </Field--> <Field Fname="ProductGuid" PropertyName="SaleList.ProductGuid" Desc="货物编号"> <x>1</x> <y>8</y> </Field> <Field Fname="ProductName" PropertyName="SaleList.ProductName" Desc="产品编号"> <x>3</x> <y>8</y> </Field> <Field Fname="ProductJiage" PropertyName="SaleList.ProductJiage" Desc="售价"> <x>5</x> <y>8</y> </Field> <Field Fname="SaleDate" PropertyName="SaleList.SaleDate" Desc="出售日期"> <x>7</x> <y>8</y> </Field> </XML>
然后从数据库中获取数据存入到实体类中,用反射遍历实体类的所有属性,如果xml中得PropertyName节点的值和当前属性的属性名相等,那么就可以通过xml提供的坐标给Excel表格赋值了。这样做的一个好处是,可以实现不同表格的通用赋值,即使翻页显示也能应对(比如上面的销售记录每页只能显示4条,而程序中是构造的10条销售记录,只能通过分页显示完),不用为每种格式都去写一种实现,即使表格的样式有所变动也不用改程序,只需更改一下xml就好了。
语言组织和表达的能力不行,还是直接上码:
using System; using System.Collections.Generic; using System.Web; using System.Reflection; using System.Xml; /// <summary> ///Excel导出 /// </summary> public class ExcelExport {
#region 变量 public List<FiledInfo> FInfoList = new List<FiledInfo>();//xml属性、坐标列表 //public System.Text.StringBuilder strB = new System.Text.StringBuilder(); ExcelOperator excel = null;//Excel操作 int sheetIndex = 0;//excel工作薄索引 #endregion public ExcelExport() { getNodeFromXml(); } /// <summary> /// 模拟从数据库获取数据 /// </summary> /// <returns></returns> public employee GetInfo() { employee e = new employee(); e.NAME = "路人甲"; e.SEX = true; e.HunYin = false; e.Tel = "15986752131"; e.Zz = "团员"; e.WorkHistory = "暂无"; for (int i = 0; i < 10; i++) { SaleInfo s = new SaleInfo(); s.ProductGuid = "产品编号" + i; s.ProductName = "产品名称" + i; s.ProductJiage = 10.23M * i; s.SaleDate = DateTime.Now.AddDays(i); e.SaleList.Add(s); } return e; }
//public string GetProperties() //{ // employee emp = GetInfo(); // GetProperty(emp, ""); // return strB.ToString(); //} //private void GetProperty(object obj, string parentProName) //{ // if (obj == null) return; // Type t = obj.GetType(); // string strParentProName = (string.IsNullOrEmpty(parentProName) ? "" : parentProName.TrimEnd(‘.‘) + "."); // if (t.IsGenericType) // { // System.Collections.ICollection ic = obj as System.Collections.ICollection; // foreach (object objTemp in ic) // { // strB.Append("---------------------<br/>"); // GetProperty(objTemp, strParentProName); // } // } // else // { // foreach (PropertyInfo pTemp in t.GetProperties()) // { // string name = pTemp.Name; // string typeName = pTemp.PropertyType.FullName; // object value = http://www.mamicode.com/pTemp.GetValue(obj, null); "String")) // { // strB.AppendFormat("属性名:{0},类型名称:{1},属性值:{2}<br/>", strParentProName + name, typeName, value); // } // else // { // GetProperty(value, name); // strB.AppendFormat("属性名:{0},类型名称:{1},属性值:{2}<br/>", name, typeName, value);
// } // } // } //} /// <summary> /// 属性赋值 /// </summary> private void SetPropertyValues(object obj, string parentProName, int index) { if (obj == null) return; Type t = obj.GetType(); string strParentProName = (string.IsNullOrEmpty(parentProName) ? "" : parentProName.TrimEnd(‘.‘) + "."); if (t.IsGenericType) { System.Collections.IList ic = obj as System.Collections.IList; int ICIndex = 0; foreach (object objTemp in ic) { //strB.Append("---------------------<br/>"); SetPropertyValues(objTemp, strParentProName, ICIndex); ICIndex++; } } else { foreach (PropertyInfo pTemp in t.GetProperties()) { string name = pTemp.Name; string typeName = pTemp.PropertyType.FullName; object value = http://www.mamicode.com/pTemp.GetValue(obj, null); "String")) { FiledInfo finfoResult = FInfoList.Find(delegate(FiledInfo finfo) { return finfo.PropertyName == strParentProName + name; }); if (finfoResult != null) { //strB.AppendFormat("属性名:{0},属性值:{1},坐标:x={2},y={3}<br/>", strParentProName + name, value,finfoResult.X,finfoResult.Y); int x = Convert.ToInt32(finfoResult.X) + index; int y = Convert.ToInt32(finfoResult.Y); excel.SetCellValue(sheetIndex, x, y, value.ToString()); } } else { SetPropertyValues(value, name, 0); } } } } /// <summary> /// /// </summary> public employee SetPropertyValue() { if (excel == null) { excel = new ExcelOperator(@"D:\程序开发\我写的东东\webLX\Excel\model\yuangong.xls"); } employee emp = GetInfo(); List<employee> list = FormatEmplyeeObj(emp); for (int i = 0; i < list.Count;i++ ) { if (i != 0) { excel.CreateNewSheetByCopy("销售记录" + i.ToString()); } } foreach (employee empTemp in list) { sheetIndex++; SetPropertyValues(empTemp, "", 0); } excel.Close(true); return emp; } /// <summary> /// 设置值 /// </summary> private void SetValue() { employee e = new employee(); Type t = e.GetType();
}
private void getNodeFromXml() { FInfoList.Clear(); string strXmlPath = @"D:\程序开发\我写的东东\webLX\Excel\modelXML\table1.xml"; XmlDocument xml = new XmlDocument(); xml.Load(strXmlPath); XmlNodeList nodelist = xml.GetElementsByTagName("Field"); foreach (XmlNode node in nodelist) { FiledInfo finfo = new FiledInfo(); finfo.PropertyName = node.Attributes["PropertyName"].Value; finfo.X = node.ChildNodes[1].InnerText; finfo.Y = node.ChildNodes[0].InnerText; FInfoList.Add(finfo); } } /// <summary> /// 格式化员工对象,便于翻页显示 /// </summary> public List<employee> FormatEmplyeeObj(employee emp) { List<employee> list = new List<employee>(); if (emp != null) { if (emp.SaleList.Count > 4)//销售记录每页显示4行 { for (int i = 0; i < Math.Ceiling(Convert.ToDouble(emp.SaleList.Count) / 4); i++) { employee infoTemp = new employee(); CloneEntityObject(emp, infoTemp); if ((i + 1) * 4 > emp.SaleList.Count) { infoTemp.SaleList = infoTemp.SaleList.GetRange(i * 4, emp.SaleList.Count-i*4);//销售记录每页显示四行 } else { infoTemp.SaleList = infoTemp.SaleList.GetRange(i * 4, 4);//销售记录每页显示四行 } list.Add(infoTemp); } } } return list; } /// <summary> /// 实体对象拷贝 /// </summary> /// <param name="srcObj"></param> /// <param name="desObj"></param> public void CloneEntityObject(object srcObj, object desObj) { if (srcObj.Equals(desObj)) { return; } if (srcObj.GetType() != desObj.GetType()) { return; } System.Reflection.PropertyInfo[] info = srcObj.GetType().GetProperties(); foreach (System.Reflection.PropertyInfo property in info) { desObj.GetType().GetProperty(property.Name).SetValue(desObj, srcObj.GetType().GetProperty(property.Name).GetValue(srcObj, null), null); } }
}
另外Excel的操作类在之前的文章中有,这里就不再贴了。